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Construction expression of fusion gene carrier and its application

A carrier and gene technology, which is applied in the field of preparation of tumor biotherapeutics, can solve the problems of enhanced antigen presentation due to stimulation, and the inability to ensure that both genes are transfected into the same cell, etc., so as to enhance immune response, expand The effect of anti-tumor range and reducing medical expenses

Inactive Publication Date: 2006-04-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The co-transfection of a single gene cannot ensure that both genes are transfected into the same cell, so that the stimulating effect of TERT on DC and the effect of IL-18 on significantly enhancing antigen presentation cannot be simultaneously exerted

Method used

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  • Construction expression of fusion gene carrier and its application
  • Construction expression of fusion gene carrier and its application
  • Construction expression of fusion gene carrier and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1. Materials

[0044] 1.1.1 Strains and plasmids E. coli competent cells DH5α; eukaryotic expression plasmids PCDNA3.1(+) / hTERT and PCDNA3.1(+).

[0045] 1.1.2 Reagents Restriction enzymes Hind III, Nhe I, EcoR I, Not I, T4 DNA ligase, Taq DNA polymerase, dNTPs, reverse transcription kit, plasmid extraction kit, etc. were purchased from Promega, USA; IL-18 and TERT antibodies and γ-interferon ELISA kits were purchased from R&D Company, total RNA extraction kit was from Invitrogene Company; apoptosis detection kit was purchased from Bender Company; MTX was purchased from Sigma Company; yeast extract, pancreatic Bacterial culture reagents such as peptone were produced by Oxford, UK; agarose, RNase, and gel recovery kits were produced by Sangon; calcium chloride, SDS, lymphocyte separation solution, and sodium acetate were domestic reagents.

[0046] 1.1.3PCR primers The primers for IL-18 gene cloning were designed with reference to the sequence registered in Genebank, us...

Embodiment 2

[0067] Example 2 Detection of Biological Function of Human Telomerase Reverse Transcriptase (hTERT) / Human Interleukin 18 (hIL18) Fusion Gene

[0068] 1. Detection of biological function of fusion gene stimulating KG-1 cells to secrete γ-interferon

[0069] Detection of γ-interferon content in cell culture supernatant: take out 0.1ml of culture supernatant of 3T3 cells transfected with fusion gene, from 1×10 6 Take 0.1ml of the KG-1 cells per ml to a 96-well plate, and use the original solution, 1:2 dilution, 1:5 dilution, 1:10 dilution, 1:20 dilution, normal 3T3 cell culture supernatant (negative control ), and standard IL-18 stimulation solution (positive control) and blank control (PBS). Three replicate wells were set up for each concentration. Quantitative enzyme-linked immunosorbent technology (ELISA method) was used, and the operation steps were carried out according to the instructions of the kit. Absorbance (A value) was measured at a wavelength of 490 nm on a microp...

Embodiment 3

[0073] 1. Electrotransfection of dendritic cells with fusion gene

[0074] (1) Take 2×10 6 cells, washed twice with serum-free and antibiotic-free medium, suspended in 400 μl of hypo-osmolar

[0075] buffer (product of Eppendorf Company) electroporation buffer.

[0076] (2) Add 10 micrograms of sterile pyrogen-free fusion gene plasmid to the above cell suspension, mix gently, and transfer to a 400 microliter electroporation cuvette (Electroporation cuvette) with a distance of 2mm and a volume of 400ul.

[0077] (3) Place the electrospinning cup in the electroporator (Multiporator Eppendorf), and 300V / 20us electric current shocks twice with an interval of 1 minute.

[0078] (4) Aspirate the cells after electroporation, wash the cells twice with 10 ml serum-containing medium (800 rpm×5 min); and culture in RPMI1640 medium with 15% FCS.

[0079] 2. In vitro induction of cytotoxic T lymphocytes (CTL) and detection of killing activity. Isolate T lymphocytes from normal human per...

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Abstract

A human telomerase reverse-transcriptase (hTERT) / human interleukin 18 (hIL 18) fusion protein with composite function is prepared from 2 cell factors with similar or complementary functions through artificial reforming of their linking terminals and configuring. The expression of its carrier is created for increasing its target killing power to tumor cells and the dendritic cell mediated immune-effect. It can be used to prepare the dendritic cell vaccine for treating cancer.

Description

technical field [0001] The invention belongs to biological technology, and relates to the construction and expression of a fusion gene carrier and its application in the preparation of tumor biotherapeutic drugs. Background technique [0002] Interleukin 18 (IL-18) is a new type of cytokine cloned in 1995, also known as interferon-γ inducible factor. It can stimulate the secretion of gamma interferon and enhance ThI type immune response. The early studies on the induction of IL-18 mainly focused on the liver. Later, some researchers used in vitro cultured macrophages to obtain IL-18cDNA through appropriate induction. In this study, the IL-18 gene was directly amplified by RT-PCR method from the RNA of peripheral blood mononuclear cells of healthy people, indicating that under physiological conditions, monocytes have the expression of IL-18MRNA. Functionally, IL-18 is closer to IL-12, and is considered to be a potential anti-tumor and anti-infection cytokine. Recent studie...

Claims

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Application Information

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IPC IPC(8): C12N15/62C12N15/63C12N15/70C12N15/79A61P35/00A61K38/17
Inventor 童向民金洁姚航平
Owner ZHEJIANG UNIV
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